italiarail.com is legitimate, but it adds a small fee to the actual ticket costs.
For the best prices, book direct with the train operator as far ahead as possible. Tickets go on sale 4 months before travel, and the cheapest tickets often sell out quickly. The discounted prices keep going up as the travel date gets closer.
You can get train times and costs from www.trenitalia.com clicking on the UK flag to change to English and using the Italian versions of city names. There is also a new operator serving Milan, Turin, Bologna, Venice, Florence, Rome, Naples and Salerno: http://www.italotreno.it/EN
This discussion is on point:
Note that at present, the 9-Euro Super Economy fares for RESERVED fast trains discussed in the thread are now available only on a few short-distance routes, while the "starting fares" on many popular tourist routes BEGIN at 19 or 29 Euros. Don't expect to find the 9-Euro fares on such routes today.
Thanks, That's very helpful.
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